Ionekon-cirgfit breaker



Oct. 20,. 1925- 1.558029 A. o. T. LIBBY r AL IGNITION CIRCUIT BREAKER Filed Jan. 1921 ATTORIIH Patented Oct. 20, 1925.

UNIT ED STATES PATENT OFFICE.

ALMOND. 1'. LIBBY; olms'r omon, AND SAMUEL or 'McKEowN, OF NEWARK, NEW Assmnofts 'ro mrrnonr ELECTRICAL common. or NEWARK, NEV] IGNPI'ION-OIRGUIT BREAKER.

mum; fled January 25, 1921.

Tana whom it my concern:

Be'it' lmown thatwaAmon D. T. LIBBY, axtiti'aen-of the United States, residing at Eas fl ege, in th coun y o E e State ofNew Jersey, G. Mo-Known, a itizen or-theUnitad- States, resid g t Newark,--i=u-the county. oft;Eesen, State or New Jersey, haveinvented certain new and useful- Improvements in Ignition-Circuit 1o Brcakersg of which the following is a description, reference being bad to the accompanying drawingandto the figures of reference marked thereon.

This invention relates to-circuit breakers and in particular to circuitbreakers forming part of a magneto or electric generator structure used for ignition purposes with internal combustion 'nes.

Considerable'diflitulty has been had inthc past with the foulingrof the contact points of the circuit breaker due to the accumulation of'dust, dint and oil thereon and many attempts have been made to prevent such fouling from taking place, with but poor success.

We'have' found that with our invention, we have reduced'the chance of fouling of the contact points to a minimum and as a matter of fact from several actual tests it has been found that at the end of long runs, the contact oints have remained ubsolutely bright an clean.

It is the main object of our invention to protect the contact points of the circuit breaker-against the chances of foulin It is another object of our invention to make a structure of this character as cheap and efiicient as is possible.

Other and minor objects will appear after reading the following specification and claims in connection with the accompanying drawings in which:

Figure 1 is a view of our circuit breaker shown as a. part of a magneto, the magneto being shown only fragmentarily. a portion of the housing enclosing the circuit breaker being broken away and another portion being shown in section to disclose hidden parts.

Serial No. 439,717.

Figure 2 is a view of tho'circuit breaker, the outer cover having been removed, and a condenser being shown in outline only.

Figure 3 is a view of another portion of our circuit breaker, a second-and inner cover having been removed.

Figure 4 is-a section along the line, 4-i of Figure 3.

Figure 5 is a section'through a fragmentary portion of our circuit breaker. i

Figure 6 is a section along the line 6--6 of Figure 3, and

Figure 7 is a view of thein'ner side ot our cam cover.

New referring more in detail to the scveral figures, 1 indicates a magneto of which the circuit breaker forming our invention is a part. In the present instance-the (licuit breaker is comprised of; a-brcaker base section 2, on which is mounted a base platc a cam cover 4 mounted on the base plate. enclosing a cam and a breaker arm actuating mechanism andsupporting on the outside'of the cover 4, the stationary contact oi the circuit breaker; and a breaker cover 5 ittingon the cam cover and housing the contact maker and breaker.

The breaker base 2 is secured to the ad justable field structure of the i'nagneto by means of the screws 6, the cup-shaped portion 7 fitting snugly over a boss on the structure as is clearly shown in the patent to Mason 1,226,233, dated May 15, 1917. A lever S is secured to the breaker base in any suitable manner so that upon rotating the breaker base, the field structure may be rotated to advance or retard the time of spark, all as will be understood. by those skilled in the art and by, referring to tho Mason patent. An apron 9 is provided to close an opening in the base of the magneto through which a primary wire is led to the circuit breaker as will be readily understood by referring to the patent hercinubow ferred to. The breaker base is providcd with a central opening 10 in which is .yoi'zi ably mounted the flange ll of the have pl E The base plate is provided with a pair iltl of elongated slots 12 and 13,'and a pair of screws 14 passing through these slots and tapped into the breaker base 2, serve to bind the base late to the breaker base in any desired adiusted relationship. This adjustment is provided in order to adjust the relative position of the breaker mechanism with respect ill-the rotor, so as to get the mainmum spark value out of thwmagneto." In order to permit the passage of the rimary wire thrp h the breaker base an plate, two align slots 15 and 16, are provided, the slot 15; in the base plate being wider than the slot 16 in the breaker bu ge that the.

ning may not be restricted upon rotation of the two parts relative to one-another. Rigidly secured upon the base plate are two 17 and 18, the post I8,- preferably made ofsteel, serving to abronze oscillatable bearing 1 ,said ring having rigidly secured thereto a bumper arm 20 carrying a bum r 21 adapted to come in contact with an to be actuated-b a cam 22 on the end of a shaft 23, said s aft being part of the magneto structure, said cam and shaft extending through the central opening afiorded by the flange 11. A spring 24 secured to the post 17 and the bumper arm 20 urges the arm to rotate in a counterclockwise direction as viewed in Figure 3. The bearin 19 is provided with a shoulder 25 upon w 'ch' rests a felt gasket 26, said gasket closing an opening 55 in 'the cam cover 4 through which the bearing'e'xtends and being encompassed by a hollow 27 in the inner side of said cover.

The cam cover 4 fits snugly onto a shouldered rtion 28 of the base plate 3 and is firmly eld thereto by means of, two screws 29 and 30 passing through a hole 56 and a hushed hole 52 in the cover and tapped into holes 31 in the base plate. Mounted upon the cam cover and insulated therefrom by a fibre sheet 32 is a bracket plate 51secured'to the cover by means of a screw 33, it being understood that-both the screws 30 and 33 are suitably insulated from the cam cover 4 as by the bushings in the hole 52 and the bushing 54. Mounted on the bracket plate and in electrical engagement therewith is a grounding post 34 rovided with a shoulder 35 resting a inst t e exposed surface of the plate 51 an passing through a bushing 53 in the cam cover 4, said grounding post being secured inlace on the underside by means of a nut. Jither the grounding post or the screw 33 may be made sufiiciently lon for attachment therewith of the primary wire as will be readily understood and thereby include the bracket plate as a portion of the electric circuit. The grounding stud also serves as a support for the breaker cover 5, said cover having an insulating bushing 36 therein to prevent electrical engagement of the cover with the grounding post and said r. .e" an. heir:-

covcr fitting snugly on a shoulder 37 on; cam cover. A t umb nut 38 screwed the post 34 aflords a means of attaching grounding wire to the post, a switch inserted in the wire torender the magneto operative when desired and at the'same t binds the breaker cover onto the cam S ami i a v U i of a su' able 1&1 e an 39, andhheld against rotation with p a tease hr ee-amt; at a v r wan 40-41 h ,r 4. A contact" int 42, said con MFPOiQv g r witgfmpontact point 43 adj'usta y A fi'omthe p v a to mounted direczly or}: the cam sever again anib4 on t, cheating, '1 w longitiidihal movementffofiisaid r; i the stud. can now-ass st bumper 21:1s actuated i contact throu w -,;'r i I ing 19 and breaker ailKH-l iil beingopen and close the stood that the opposi'te'trminal offllb w mary and the contact M A bracket 48 on the mail 51 and a stud 49 on serve tosuppor't a condenses able type, said condeneer ficlnglt acrossthe contactipointnf "1'. We have thus'providetl a for a magneto in which u are isolated in b comp'a t breaker cover andthetotikof e separate from thefq mlfi fb f l latter are enclosedwithin which constitutes. the opprating for the circuit breakerfl greasethr'own irom'? e in" other operating stru rs the compartment in which are house It will be" M I use and)! shown in s 11th ff points are in a laugh plane of the onlyopening toth partment in which the 'circlflitb 1 6r housed, so that if'bychandelanyiierei terial should enter 6 m through this opening,gravit won d the material to move in a "rection from the'contact points. K p "I, Having thus deseribed' our 'in'ven what we claim is:' I i In a circuit breaker, a base; plate adjustable thereon'and t I, a cam cover mounted on'fsaid basep means for securing said' cam cover toj base plate, an insulated'bi acket plate mo; '1 ed on the cam cover, 'a grounding mounted on said bracket late, said 3 ing post being rigidly h d -i n place trical engagement with the insiilatedbr's plate, a circuit breaker covermountedorr cam cover positioned by and insulated ing; ried in a bracket 44 bent up 51. 'A-spria mmw. r

thereto a bumper arm, a bumper in said arm,

a cam mounted on a shaft extending into the cam cover cooperating with said bumper, spring means secured to the bumper arm and the remaining stud to urge the bumper into i engagement with the cam, said bearing extending through a packed opening into the compartment enclosed by the circuit breaker cover, and a contact carried by said bearing cooperating with a contact mounted on the bracket plate.

In testimony whereof, We have hereunto aflixed our signatures.

SAMUEL O. MCKEOWN. ALBION D. T. LIBBY. 

